How can I ensure my Rust environment is properly configured to avoid this error?

First, verify that you have Rust installed and that `rustc` is in your system's PATH. You can do this by opening a terminal and running `rustc --version`. If it's not found, you'll need to install Rust using `rustup` (https://rustup.rs/). Ensure you have the default toolchain installed by running `rustup default`. Additionally, check your project's `Cargo.toml` file to make sure it correctly specifies dependencies, especially if you are using the 'tokenizers' crate directly or indirectly.